Canon EOS M50 Mark II Advanced User's Manual page 140

One-Shot AF for Still Subjects
This AF operation is suited for still subjects. When you press the shutter button halfway, the
camera will focus only once.
Once a subject is in focus, the focusing AF point turns green and the camera beeps. If
focus is not achieved, the AF point will turn orange.
The focus remains locked while you hold down the shutter button halfway, allowing you
to recompose the image before taking the picture.
For details on the continuous shooting speed for continuous shooting, see
Note
If [ : Beep] is set to [Disable], the beeper will not sound when focus is achieved.
The focus remains locked while you hold down the shutter button halfway, allowing
you to recompose the image before taking the picture. This is called "focus lock."
See Lens Electronic MF
focusing.
when using a lens that supports electronic manual
140
Drive Mode.